Tool-stock-driving mechanism.



J. 011118511111. TOOL STOCK DRIVING MECHANISM.

APPLIUATION FILED MAY 25, 1911 Patented A pr.15, 1913.

5 SEEETSSHEET 1.

coLpMBIA PLANOGRAPH co., WASHINGTON. D. c.

Patented Apr. 15, 1913.

' 5 SHEETS-SHEET 2.

WHWLQQAGO COLUMB J. G. TASSBY.

TOOL STOCK DRIVING MECHANISM.

APPLICATION FILED MAY 25, 1911.

1,058,922. v Patented Apr. 15, 1913. T i J6 60 "59 6/ 5 SHEETSSHBET 3.

35 Jfljiamy J. G.- TASSBY.

TOOL STOCK DRIVING MECHANISM.

APPLICATION FILED MAY 25. 1911.

Patented Apr. 15, 1913.

MN N\\ \N Q awuewboz 5 SHEETS-SHEET 5.

JOE GEPHAS TASSEY, OF NASHVILLE, TENNESSEE.

TO OL- S'IOCK-DRIVING MECHANISM.

Specification of Letters Patent.

Patented Apr. 15, 1913.

Application filed May 25, 1911. Serial No. 629,483.

To all whom it may concern Be it known that I, J on CEPrIAs Tassnr, a

citizen of the United States, residing at Nashville, in the county ofDavidson and State of Tennessee, have invented certain new and usefulImprovements in Tool Stock-Driving Mechanism; and I do declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention has reference to mechanism for driving rotary tools, suchfor instance as a flue expander or similar tool whose stock usuallyrotated for a time in one direction and then needs to be reversed and rotated in the other direction; and the object of the same is to improvethe driving mechanism for such a tool stock, which is interposed betweenit and. the motor.

To this end the invention consists in the improved construction,arrangement and combination of parts of machines which will behereinafter fully described and afterward specifically claimed.

In order that the construction and operation of the invention may bereadily understood, I will now proceed to fully and specificallydescribe one embodiment of 1t, which I have illustrated in theaccompanying drawings, in which,

Figure 1 represents a view in side elevation of my improved device; Fig.2 represents a view of the same in end elevation looking at the righthand end as shown in Fig. 1; Fig. 3 represents a vertlcal transversesectional view taken on the plane indicated by the broken line 33 ofFig. 1; Fig. 4 represents a longitudinal vertical section on the planeindicated by the broken line 4-4 of Fig. 3; Fig. 5 represents ahorlzontal transverse sectional view on the plane indicated by thebroken line 5 5 of Fig. 3; Fig. 6 represents a detail vertical sectionalview through the air valve mechanism on the plane indicated by thebroken line '66 of Fig. 5; Fig. 7 represents a detail transversesectional view taken on the plane inclicated by the broken line 7-7 ofFig. 5; Fig. 8 represents a sectional view taken on the plane indicatedby the broken line 88 of Fig. 2; Fig. 9 represents a detail view inelevation of the expander head detached;

Fig. 10 represents a front end elevation of the expander illustrated inFig. 9; Fig. 11 represents a transverse vertical sectional view taken onthe plane indcated by the broken line 1111 of Fig. 8; Fig. 12 representsa detail view partly in elevation and partly in section of the reversingring or handle and connections.

Like reference characters mark the same parts wherever they appear inany of the figures of the drawings.

' Referring specifically to the figures of the drawings, the casing inwhich the mechanism of the air motor is inclosed comprises heads 20 and21 at the ends, and curved connecting sides and bottom 22, the latterextending from slightly above the center of the casing on one side as at23, Figs. 1 and 3 to a corresponding position as at 24 in Fig. 3, atwhich points converging upper side plates 25 and 26 are secured by anysuitable means, as for instance screws 27, the general outline of atransverse section through the combined motor and expander beingsubstantiallyoval as indicated in Figs. 2 and 3. An additional casingindicated at 28 in Figs. 1, 4, and 5 is secured to the left hand end ofthe main casing as illustrated in Fig. 4 by means of and for a purposehereinafter described.

The air motor comprises a crank shaft 29 journaled in the casing head 21at one end and the casing head 20 at the other end, which shaft isprovided with two cranks 30 and 31 diametrically opposite each other,upon each of which is pivotally mounted two piston rods, those on thecrank 31 being indicated at 32 and 33 and those on the crank 30 beingindicated at 34 and 35, in Fig. 3, these rods 33 and 35 being alsoillustrated in Fig. 4.

At suitable points indicated, shafts 36 and 37 are journaled, on theformer of which are mounted to oscillate two cylinders 38 and 39, whileupon the shaft 37 are similarly mounted two oscillatory cylinders 40 and41. In each of these cylinders is mounted slid ably a piston head, asbest illustrated at 42 and 43 in Fig. 3 in full lines and 44 and 45 inthe samefigure in dotted lines, the piston head 42,,being attached tothe inner end of the piston rod 32, the piston head 43 being attached tothe piston rod 33, the piston head 44 being attached to the piston rod34,

and the piston head 45 to the inner end of the piston rod 35. The shafts36 and 37 have air chambers and serve as inlet pipes to supplycompressed air from a suitable source through the medium of a supplypipe 46, Figs. 1 and 2, and when this air 1s sup plied and the pistonsreeiprocated, the crank shaft 29 is rotated and the cylinders willoscillate on the shafts 36 and 37 in a well known manner.

Journaled centrally in the casing heads 20 and 21 is a drive shaft 47upon which are formed two eccentrics 48 and 49, Fig. 4, encircled byrings 50 and 51 from which project radial arms 52 and 53, which arepivotally jointed by means of pins 54 and 55 to radial arms 56 and 57projecting from rings 58 and 59 surrounding the stock 60 of the toolbeing driven, which at this point is provided with longitudinal ribs 61.

Extending radially from the rings 58 and 59 are sleeves 62 and 63 havinginwardly projecting annular flanges 64 at their outer ends, and havingslidably mounted within them blocks 65 and 66 provided on their innerends' with ratchet teeth 67 and 68 adapted to engage with thelongitudinal ribs or teeth 61 ofthe expander stock 60. Attached to theblocks 65 and 66 are stems 69 and 70 which pass through the opening inthe annular flanges 64 and are surrounded by springs 71 and 72 bearingexpansively upon the flanges 64 and the blocks 65 and 66, whereby thelatter, with their stems, and teeth 67 and 68 are yieldingly pressedinto the spaces between the ribs 61 of the stock 60. The teeth 67 and 68project beyond the ends of the blocks 65 and 66, the tooth 67 on block65 being to the front of a plane passing longitudinally through thecenter of the block, and the tooth 68 to the rear of a similar planethrough block 66, the terms front and rear having relation to theoperative direction of oscillation of the blocks.

The stems 69 and 70 are connected, by means of blocks 73 and 74, links75 and 76, blocks 77 and 78, and suitable pivot pins 79, 80, and 81 tothe shafts 82 and 83 journaled in and projecting through bearings 84 and85 in the casing, the shaft 82 being slotted in its outer end to receivea handle or ring 86 secured thereto by asuitable bolt or rivet 87, saidshaft being also provided with a gear wheel 88 meshing with a gear wheel89 secured on the shaft 84, said gear wheel 88 engaging between flanges90 on the sides of the gear wheel 89.

By turning the handle 86, the shafts 82 and 83, with their connections,to and in eluding the teeth 67 and 68, will be reversed in position withrespect to the stock 60 of the expander, so that without changing themotion of the eccentric shaft 47 and its connections through to thesleeves which oscillate on the stock 60, the direction of motion of saidstock will be reversed, the tooth 67 then'being in the rear of the planepassing centrally through its block and. stem and the tooth 68 to thefront thereof. The stems 69, and 70 are slotted as at 91, and 92, inFig. 3, at their inner ends and the pins 79 pass through said slots,whereby the stems and blocks will give slightly, compressing the springssurrounding them, when the teeth 67 and 68 are moving baclnvardly overthe ribs 61 of the stock 60 after the manner of spring ratchet teeth.Springs 790 and 810, secured to the blocks by pins 79 and 81, bear onthe edges of the links 75 and 76 and tend to maintain the blocks andlinks in alinement.

The shaft 29, in Fig. 4, is provided with roller bearings 93 for itsjournals in the casing heads 20 and 21, and has a reduced angular end 94outside of the casing head 21 upon which is mounted a gear wheel 95which meshes with a gear wheel 96 similarly secured upon a reducedangular extension 97 of the shaft 47, both the shafts 29 and 47 beingprovided with threaded ends as at 98 and 99 beyond their respectivegears, upon which ends suitable nuts 100 and 101 are threaded toproperly secure the gears on the shafts. The shaft 47 is provided withsuitable roller bearings 102 in its end journals and 103 for itseccentric rings.

From the foregoing it will be evident that upon the admission of air tothe cylinders, the shaft 29 will be rotated and by virtue of the gearing95 and 96, the eccentric shaft 47 will also be rotated, which in turn,will 05- cillate the arms 56 and 57 on the rings 58 and 59 on the stock60 of the expander, which oscillation, through the medium of the ratchetteeth 67 and 68 and connections as described, will cause said stock 60to be rotated, and that the direction of said rotation may be reversedby turning the ring handle 86 without changing the direction of movementof any of the parts except the stock of the expander itself. The ends ofthe shafts 29 and 47 which project beyond the casing head 21, and thegearing 95 and 96 thereon, are incased in the supplementary casing 28hereinbefore referred to, which casing is held in position on the maineasing by means of bolts 102 which are threaded into the casing head 20,passed through the casing head 21 and are provided with suitable nuts103, a shoulder 104 being provided to bear against the inner side of thecasing head 21 to properly posit-ion the parts when the nuts are turnedtightly against the su pleinentary casing 28.

eferring particularly to Fig. 5, the manner of securing the hollowshafts 36 and 37 in the casing, and the manner in which air is admittedto the cylinders through these shafts will now be explained. It will beobserved that the two shafts are located in opposite sides of the casingand are pro vided on reduced outer ends 105 with collars 106 threadedinside and outside, which bear against the outer face of the casing head20 and these shafts are further provided with reduced ends 107 which areseated in sleeves 108 formed on the supplementary casing 28,

threaded rings 106, and held rigidly in contact therewith by means ofcaps 112 having inwardly projecting annular flanges 113 embracingoutwardly projecting flanges 114 on said fittings- The two branch pipes110 are threaded into a central T-fitting 115, the opening in the stemof said fitting being threaded to receive the threaded end 116 of asleeve 117, and a knurled ring 118 being fixed upon extensions 119 ofthe fitting and sleeve, suitable packing rings being providedbetweensaid extensions and the knurled ring, and the latter being provided witha central inwardly projecting annular flange 120 between the adjacentends of the fitting and the sleeve. The outer end of the sleeve 117 isthreaded to receive a cap 121 in which the end of the air supply pipe 46is secured. In the T-fitt-ing 115 is provided a recess 122 whichprojects laterally from the transverse recess of the head of the fittingand whichis provided, located eccentricallywith relation to the stem ofthe fitting, with two longitudinal bores, indicated in dotted lines at123 in Figs. 5 and 6, with which longitudinal bores 124 in the innerannular flange 120 of the knurled sleeve 118 may be brought to registerin whole or in part by turning said knurled sleeve on the packingextensions of the T-fitting and the sleeve 117. The last named sleeve isalso provided with a recess 125 which has a lateral extension 126 fromwhich extend similar longitudinal bores 127 which are normally inregister with the bores of the T-fitting and consequently may be broughtinto and out of register with the bores 124 of the knurled sleeve. Thisrecess communicates with a recess 128 in the end of the sleeve 117 whichis covered in part by the threaded cap 121 above referred to. A part ofthe knurled ring extending partially around its inner edge is cut awayleaving a space 129, see Fig. 1, in which plays a projection 130 on theouter edge of the stem of the T-fitting 1'15, whereby the extent ofrotation of the knurled sleeve 118 on the stem of the T-fitting islimited, an extent of rotation being permitted which will carry thebores 124 of the knurled ring entirely out of register with the bores ofthe T-fitting' and sleeve 117 when moved to the extreme in onedirection, exactly into register with said bores when moved to theextreme in the opposite direction, and into a variable amount ofregistration from one extreme to the other as the knurled ring isrotated to different points. Thus the amount of air ad mitted can bevery minutely determined. For the purpose of rendering the recesses 122and 125 accessible, they are closed on one side by screw plugs 131 and132 respectively, and steel rings 133 are provided to transmit to thepacking rings the compressive force of the parts when brought together,to properly seal the joints. The air admitted to the shafts 36 and 37 inthe manner described will pass through the chambers 134 of said shafts,and from thence to the cylinders, through a transverse port 135 leadingfrom the central chamber to the cylinder through a port 136 out in theend of the cylinder, whenever the posit-ion of the cylinder on its shaftis such as to bring the port 136 into register with the port 135. Thisposition will be attained at the end of the return stroke of the piston,which position the cylinder 40 is about to reach as illustrated in Fig.3, said cylinder being represented as in position immediately prior tothe beginning of the return stroke of its piston and as oscillating tothe left. It will be observed that the least movement in that directionwill bring ports 138 and 136 into register and exhaust the air formerlyadmit-ted to drive the piston forward and permit of the return stroke.The exhaustion of the compressed air from the cylinder takes placesuddenly at the end of the working stroke, when the piston will pass arow of ports 137 through the wall of cylinder, opening these ports. Atthis time a port 138 in the periphery of the shaft has been brought intoregister with the port 136 and an outer exhaust port 139, and as thesupply of air has at this time been cut off by the movement of thecylinder taking the port 136 out of register with the port 135, thepressure of air has at once, by the opening of ports 137, been reducedto ordinary atmospheric pressure, the piston on its return stroke willonly have this pressure to oppose it and the air at such pressure canreadily be exhausted through ports 136, 138, and 139 without impedingthe return movement of the piston.

.The return stroke of the piston will first close ports 137 and duringthis return stroke the cylinder will gradually move on its shaft to theposition indicated on the right" of Fig. 3, where the cylinder is shownas having just been moved far enough to carry the port 136 out ofregister with the port 138 thus closing the outer exhaust port 139. Atthe same time, the port 136 is about to register with-the port 135 toadmit air to propel the cylinder on its next Working stroke. Theoperation of each cylinder is the same as that of the others and byattaching the pistons of two of them to' one crank and'the other two ito the other crank diametrically opposite the first, the actions of thecylinders and pistons of one crank will be the opposite of thoseoperated by the other crank and while two of the pistons are makingtheir working strokes, the other two will be making their returnstrokes, making the impulses regular and effective.

The stock 60 of the expander is mounted in roller bearings 140 in asleeve 141 proj ecting downward from casing heads 21, and ball bearings142 held in a bearing ring or sleeve 143 projecting upward from casingheads 20, the stock being prevented from moving longitudinally by ashoulder 144 which bears against the sleeve 141 and a shoulder 145 whichbears against the ball bearing 142, the ball bearing itself, beingbacked by an inner annular ring 146 on the inside of the bearing sleeve143.

The oscillating rings 58 and 59 hereinbefore referred to, which carrythe sleeves 62 and 63 in which the pawls operate for engaging thelongitudinal ribs or teeth 61 and the stock 60, are held againstlongitudinal displacement on the stock 60 by means of the bearingsleeves 141 and 143, between which they are located, as clearlyindicated in Fig. 8. The inner end of the stock 60 is recessed andthreaded as at 147 to receive the threaded end of a sleeve 148hereinafter referred to.

At 149 is shown a portion of the tube sheet of a boiler, inserted inwhich is a portion of a tube 150.. Within the tube 150, see Fig. 8, isshown a series of wedges 151 having their inner faces tapered withreference to the plane of the tube sheet 149 to fit upon the tapered end152 of the main bolt 153 of the expander, such wedges being retained inposition on the tapered portion 152 of the main bolt by means of anelastic band 154. The main bolt 153 is threaded at its rear end as at155 and is drawn into the middle of the wedges 151 to expand them bymeans hereinafter to be described, such expansion of the wedges causingtheir annularly projecting knuckle 156 to form grooves 157 in the tubejust inside of the tube sheet 149. The wedges 151 are provided with.suitable notches in their outer edges which, when the wedges are broughttogether as in Figs. 8 and 11, form an almost continuous annular grooveto receive the elastic band 154 and prevent its displacement.

Mounted loosely on the tapered end 152 of the bolt 153 is a rollercarrying frame comprising a ring 158 upon which are mounted radiallyprojecting arms 159 carrying at their outer ends curved plates 160having beveled outer edges 161, said plates being arranged in a circleand being concenme with the ring. The outer faces of the ring 158 areflat, and these flat faces, indicated at 162, in connection with thegrooved sides 163 of the arms 159, and the projecting ends 161 of theplates 160, tend to form a series of recesses, each of which is adaptedto receive a roller as at 164, 165, 166, and 167, the ring 158, itsradial arms 159 and the plates 160, and the rollers asspecified allbeing inclosed within a cover, the sleeve 168, in which are seatedscrews 169 which project through the inner face of the cover sleevebeyond the plates 160, thereby preventing the entrance of said platesinto the cover sleeve beyond a proper position.

The rollers 164, 165, 166, and 167 are all provided with peripheralgrooves and ribs formed at the edges of said grooves, the rib on the endof each roller which rests against the flat outer surface of the ring158, as indicated at 170, being of greater diameter than the outer rib171. The ends 161 of the plates 160 project into the grooves of therollers adjacent to the outer ribs 171 and the rollers themselves arekept in contact with theflat sides of the ring 158 by means of springs172 seated in recesses in the outer ends of the rollers and bearingagainst the inside of the cover sleeve 168. The rollers 164 and 166 areheading rollers for turning the edge of the tube and the rollers 165 and167, having grooves and ribs of slightly different contour, are for thepurpose of finishing the bead after it is turned over by the beadingrollers.

Shrunk or otherwise rigidly secured upon the outside of the sleeve 148is a ring 173 which carries on its outer edge a sleeve 174 and a seriesof screws 175 pass radially through this sleeve into the sleeve 148, atthe same time passing through an opening 176 in each of a series of lugs177 which are thus pivotally mounted on the outer face of the sleeve 148and which are provided with fiat ends 179, rounded at opposite edges,and

bearing against the ring 173 and a ring 180 which is rigidly securedwithin the cover sleeve 168. Around each of the screws 175 is a spring181, one end of which bears against the ring 173 while the other end isturned into an opening in the lug 177, the tendency of this spring beingto turn the lug and its axis into position to cause the flat endsthereof to jam against the rings 173 and 180, and thus prevent theturning of the ring 173 and the lugs in one direction, the rounded endsof the lugs permitting of its free turning in the opposite direction,the sleeves 174, ring 173, and the lugs and their springs, 'thus actingas a clutch to govern the relative rotation of the sleeve 148 and ,thecover sleeve 168.

The reduced outer end of the stock 61 is threaded eXteriorly andreceives on its thread a sleeve 182, the threads being lefthanded. Thesleeve 182 is provided with an outwardly projecting annular flange 183which bears against the ring 146 and with an inwardly extending annular.flange 184 which bears against the end of the stock 60. The sleeve 182is also provided with an ex terior thread which engages a sleeve 185provided with an inwardly extending annular flange 186 which engages aflange on a ball bearing ring 187 so that when the sleeve 185 is screwedup tight, it will maintain the parts between the ball bearings in properrunning position. An opening 188 is provided in the sleeve 143 throughwhich to insert a screw 189 to rigidly secure the stock 60, sleeve 182,and sleeve 184 against accidental displacement.

The sleeve 184 is provided on its outer end with clutch teeth 190 whichare adapted to engage with Similar teeth on the end of a sleeve 191, thelast named sleeve being slidable longitudinally on a sleeve nut.192threaded on the main, bolt 158, but prevented from rotating therein bymeans of lugs 193 projecting from the sleeve nut 192 into longitudinalgrooves 194 in the'interior of the clutch sleeve 191.

A ring 195 i threaded in the outside of the sleeve nut 192 and carries,shrunk or otherwise rigidly secured thereto, a knurled ring 196 providedwith an inwardly projecting annular flange to engage with an outwardlyprojecting annular flange on the clutch ring 191, whereby the travel ofthe ring 195 on the sleeve nut 192 caused by the turning of the knurledring 196, will cause the longitudinal movement of the ,clutch ring 191to engage or disengage its clutch teeth with the teeth 190 of the sleeve185. Upon the end of the sleeve 192 is threaded a knurled ring 197 and ascrew 198 serves to fix the knurled ring against removal therefrom. Thisknurled ring and sleeve nut 192 will be hereinafter referred to as themain nut.

The operation of the machine will be understood from the followingdescription: A pipe or bar 199 is projected into a tube below the one tobe expanded, and the wedges 151, on a portion of the tapered end 152 ofthe main bolt 153 of a size to permit of them to be passed into the tubeto be eX- panded, are placed in position as shown in Fig. 8. The stock60 and its connected parts are then moved inward on the main bolt untilthe rollers contact with the outer edge of the tube. It is to beunderstood that the air has not yet been turned on to rotate the stock.By pulling on the main nut, the bolt 153 will be drawn outward until thewedges engage tightly in the tube. The knurled ring 196 is turned uponthe main nut until it rests against the same and until the teeth 190have been disengaged from the teeth of the sleeve 185. By now turningthe main nut on the bolt 153, the front surface of the main nut willbear against the roller bearing sleeve 187 and draw the main bolt 153outward, which will spread the wedges 151 and tighten them in the tube,at the same time pressing the stock 60 and all of the part-s inwardforcing the rollers 'and the machine started so that the stock :60 willbe rotated in the manner before described until the head is properlyturned on the outer end of the tube. In the meantime,

the rollers can be pressed against the outer end of the tube by turningup the knurled .ring 197 on the main nut. When the operation has beencompleted, the knurled ring 196 is turned back until the teeth of theclutch sleeve 191 are clear of the teeth 190, when the machine will beheld between the roller bearings at one end and the ball bearing at theother and its continuous rotation will smooth off the work. The air isnow let off by again turning the knurled ring 118, the ring 196 againturned to engage the clutch teeth, the ring 86 turned to reverse thepawls 67 and 68, and the air again turned on so as to run the machinebackward, which will loosen the main nut by whirling it off the end ofthe bolt and by tapping the end of the bolt with a soft hammer, the boltwill drop back in the wedges which will permit them to approach closelyenough to each other on a smallerpart of the tapered end 152, to bepulled out of the fine.

The oval shaped heads of'the casing. are of special importance as willappear to those skilled in the art from a careful inspection of Figs. 1and 2. Much trouble has been encountered in operating tube expandersowing to the close and inconvenient spaces in which they are operated.

1l ith the oval shaped heads with their sharp or pointed ends upward,and the tool stock in the upper thin or smaller part of the easing,there is no part of the casing above or on either 'sideof the end of thetube to be expanded and free space is left for the operator tomanipulate the machine and to get at the end of the tube being expanded.The main body of the casing; made large enough to accommodate themechanism of the motor, is below the stock and, while affording ampleroom for the required purposes, it does not interfere with or preventfree access to the work.

Having thus described my invention, what I claim as new is:

1. In a device of the character described the combination with a casing,of a tool stock journaled therein having longitudinal ribs on itsperiphery, sleeves surrounding the stock, means foroscillating thesleeves on the stock, radial sleeves projecting from the aforesaidsleeves, yieldingly pressed blocks in the radiating sleeves, teeth onthe blocks normally engaged with the longitudinal ribs of the stocks,and means to rotate the blocks and teeth half-way around to reverse therotation of the tool stock without interrupting the oscillation of thesleeves thereon.

2. In a device of the character described, the combination with arotatable tool stock having longitudinal ribs on its periphery,oscillatory sleeves surrounding the stock and provided with radiatingsleeves, blocks slidably and rotatably mounted in the radiating sleevesand yieldingly impelled toward the tool stock, teeth on the blocksengaging the ribs, means for rotating the pawl blocks on their axes toreverse the position of the teeth with reference to the longitudinalribs, and means for oscillating the sleeves surrounding the tool stock.

3. In a device of the character described, the combination with acasing, of a tool stock journaled therein and provided with longitudinalribs, oscillatory sleeves surrounding the stock, radial sleevesprojecting from the sleeves on the stock, blocks in said radiatingsleeves, yieldingly pressed inward, teeth on the inner ends of theblocks contacting with the ribs, stems projecting from the pawl blocks,parallel geared shafts, means for rotating said shafts, and connectionsbetween the stems of the pawl blocks and the parallel geared shafts.

4. In a device of the character described,.

the combination with a casing, of a tool stock journaled therein andprovided with longitudinal ribs, oscillatory sleeves surrounding thestock, radial sleeves projecting from the sleeves on the stock, blocksin said radiating sleeves, yieldingly pressed inward, teeth on the innerends of the blocks contacting with the ribs, stems projecting from thepawl blocks, parallel geared shafts, means for rotating said shafts, anduniversal joint connections between the stems of the pawl blocks and theparallel geared shafts.

5. In a device of the character described, the combination with acasing, of a tool stock journaled therein and provided with longitudinal ribs, oscillatory sleeves surrounding the block, radial sleevesprojecting from the sleeves on the stock, blocks in said radiatingsleeves yieldingly pressed inward, teeth on the inner ends of the blockscontacting with the ribs, stems projecting from the pawl blocks,parallel geared shafts, means for rotating said shafts, links pivoted tothe stems of the pawl blocks, other links bivotally connecting the firstnamed links with the parallel geared shafts by pivots at right angles tothose between the first named links and the pawl block stems, andsprings coacting with said links for the purpose set forth.

6. In a device of the character described, the combination with acasing, of a tool stock journaled therein and provided with longitudinalribs, oscillatory sleeves surrounding the stock, radial sleevesprojecting from said oscillatory sleeves, blocks in the radiatingsleeves yieldingly pressed inward, teeth on the inner ends of the blockscontacting with the ribs, stems projecting from the pawl blocks andhaving longitudinal slots, a pair of parallel shafts in alinement withthe stems, gearing connecting the parallel shafts, a link for each stemhaving one end pivotally connected in the longitudinal slot thereof, alink pivotally connected to each of the parallel shafts, and pinspivotally connecting the free ends of the links of each pair.

I 7. The combination of a tool stock provided with a ratchet member,oscillatory members, means for oscillating the same, blocks carried bysaid oscillatory members and coacting with the ratchet member, saidblocks being mounted for movement toward and from the ratchet member andadapted to be turned to reversed position with respect to the latter,springs pressing the blocks toward the ratchet member, a pair ofparallel geared shafts slidably and rotatably mounted, flexibleconnections between said arallel shafts and said blocks, and means orcontrolling one of said parallel shafts.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JOE CEPHAS TASSEY.

lVitnesses:

J. B. BRADLEY, JOHN DIX DOYLE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, I). G.

